RANKING · 2024 ACS · 56 SHOWN OF 56

Largest households, Montana counties

Montana counties ranked by average household size (2024 ACS). This list covers the 56 counties in Montana that qualify, ranked against each other statewide. The median across all 56 is 2.37. Biggest climber in the top 100 since 2020: Wibaux County, MT, up 34 places to #12.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDMost expensive homes Cheapest homes Highest median rent Lowest median rent Highest homeownership rate Highest renter share

YEAR2010 2020 2024

RANKPLACESTATEPOPAVERAGE HOUSEHOLD SIZEVS 2010

01Big Horn County, MTMT12,7523.32−6%

02Roosevelt County, MTMT10,2423.32+10%

03Glacier County, MTMT13,4633.04−2%

04▲1Blaine County, MTMT6,8602.96+9%

05▲7Broadwater County, MTMT8,4932.70−2%

06▲8Chouteau County, MTMT5,8652.67+3%

07▼3Rosebud County, MTMT8,2532.63−6%

08▼2Pondera County, MTMT6,0722.58−3%

09▲1Lake County, MTMT33,3922.56+10%

10▲3Hill County, MTMT16,1672.530%

11Richland County, MTMT11,3772.53+14%

12▲34Wibaux County, MTMT8852.52−7%

13▼5Liberty County, MTMT1,9572.52−9%

14▲3Garfield County, MTMT1,1482.50+3%

15▼8Jefferson County, MTMT13,3292.50+6%

16▲26Valley County, MTMT7,3852.50+9%

17▲31Powder River County, MTMT1,7812.48+3%

18▼2Ravalli County, MTMT48,5822.48+6%

19▼10Flathead County, MTMT115,4292.47+2%

20Teton County, MTMT6,4962.430%

21▲17Madison County, MTMT10,0262.42+23%

22▲23Sheridan County, MTMT3,4362.42+24%

23▲18Sanders County, MTMT14,0622.40+10%

24▲6Toole County, MTMT5,2112.40+11%

25▼10Stillwater County, MTMT9,4452.380%

26▲24Musselshell County, MTMT5,5822.37+11%

27Yellowstone County, MTMT172,6922.37+1%

28▼10Sweet Grass County, MTMT3,7622.37−2%

29▼5Carbon County, MTMT11,4662.360%

30▲13Dawson County, MTMT8,6922.33+7%

31▼10Gallatin County, MTMT128,7402.330%

32▲3Golden Valley County, MTMT8442.32−5%

33▼5Cascade County, MTMT85,0292.30−3%

34▼12Lewis and Clark County, MTMT75,3312.30+1%

35▼4Lincoln County, MTMT22,3282.30+11%

36▼3Phillips County, MTMT4,2032.29+4%

37▼8Custer County, MTMT12,0342.28+5%

38▼6Fallon County, MTMT2,9592.28−3%

39Mineral County, MTMT5,1852.28−4%

40▲4Judith Basin County, MTMT2,1622.25−1%

41▼7Prairie County, MTMT1,1122.24+3%

42▼6Silver Bow County, MTMT36,1182.24+2%

43▼17Missoula County, MTMT123,5132.23−5%

44▲7Powell County, MTMT7,1572.22−7%

45▼26Granite County, MTMT3,6582.21+6%

46▲3Beaverhead County, MTMT10,0432.21−2%

47▼24Wheatland County, MTMT2,1002.18−4%

48▲6Carter County, MTMT1,3832.14−3%

49▼24Meagher County, MTMT2,1372.13−19%

50▼3Fergus County, MTMT11,8252.12−6%

51▲1Park County, MTMT18,2142.08−5%

52▼15McCone County, MTMT1,7202.04−17%

53▲3Treasure County, MTMT7282.03−24%

54▼14Petroleum County, MTMT5482.02−4%

55Daniels County, MTMT1,6122.01−5%

56▼3Deer Lodge County, MTMT9,7091.97+3%

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES